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physics

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please check my answers and help me with the first one.

how can you charge an object negatively with only the help of a positively charged object?
-This one I am not too sure,

when one material is rubbed against another electrons jump readily from one to the other but protons do not. why is this? (think in atomic terms)
-Is it because they are in an excited state

how do electrical field lines indicate the strength of an electric field?
-The closer they are together, the stronger the electric field.

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